calendar range: update on remote after an unpdate

src/Bundle/ChillCalendarBundle/RemoteCalendar/Connector/MSGraph/RemoteEventConverter.php

@@ -107,6 +107,11 @@ class RemoteEventConverter
         );
     }
 
+    public function getLastModifiedDate(array $event): DateTimeImmutable
+    {
+        return DateTimeImmutable::createFromFormat(self::REMOTE_DATETIMEZONE_FORMAT, $event['lastModifiedDateTime']);
+    }
+
     /**
      * Return a string which format a DateTime to string. To be used in POST requests,.
      */